Hoisting apparatus



Oct. 11, 1932. c. G. WRIGHT uorswme APPARATUS Filed May 21, 1929 2 Sheets-Sheet 1 0d. 11, 1932. c, wRlGHT 1,882,051

" HOISTING APPARATUS Filed May 21, 1929 2 Sheets-Sheet 2 2y AITTORN Y? raised and lowered, and among t Patented Oct. 11, 1932 I UNITED CHARLES G. WRIGHT; 0F RICHMOND HILLNEW YORK, ASSIG'NOR, BY M'ESNE ASSIGN- MENTS, TO BUCYRUS-ERIE COMPANY, 0E SOUTH MILWAUKW, WISCQNSH', A 00R- ]?ORATION OF DELAWARE HOISTING arraaartrs Application filed may :31, 1999. Serial N0. $8 1,734.

This invention relates to an improvement in hoisting apparatus of the type employing a mast rotatable about a fixed standard and carrying a boom which is adapted to be raised and lowered, and among its objects are the provision of a construction embodying an improved type of mast and an improved drive for rotating the mast whereby excessive strains on the apparatus due to the use of positive driving mechanism are eliminated.

In the drawings accompanying this application:

Fig. 1 is a part sectional elevation of an apparatus in which my invention is incorporated;

Fig. 2 is a section taken on the line 22 of Fig. 1; Fig. 3 is a sectional plan view of the apparatus of Fig. 1; and

Fig. 4 is a section on the line 4-4 of Fig; 2.

Referring to the drawings in detail, my improved apparatus comprises a mast 1 suitably supported on roller bearings 2 on a fixed standard 3 about which the mast is driven.

The mast carries a boom4 ada ted to be he objects of this invention is the provision of an improved construction for the lower part of the mast and improved driving means for rotating the mast 1 about the standard 3.

The lower part of the mast as will be seen from Figs. 1 and 2 has a fiange5 formed integral therewith, this flange extending laterally and downwardly. The flange is consid-- erably larger in diameter than the main body of the mast and provides in part the bull wheel of the apparatus.

In this connection the web 6 has a tooth segment 8 removably attached to its outer face. An inspection of Fig. 3 will show that the web 6 of the flange is provided at 7 with a recess adapted to receive the tooth segment 8, which- The sprocket 11 is mounted on astubshaft 12 carrying a mitre gear 13 on its lower end,

as viewed in Fi 2. The gear 13 meshes with a pair of mitre gears 14 and 15, respectively, these two gears meshing with opposite 'sides of the gear 13. The gears 14 and 15 are rotatably mounted on a shaft 16 mounted in suitable bearings 17 and 18. The thrust of gear 15 is taken on the bearing 18, the hub of the gear passing through the side of the housing enclosing the gears, so that on any wear due to thrust of gear 15 it is merely necessary to renew the bearing instead of the wall of the gear housing. Carried by the shaft 16 and rotatable therewith is clutch mechanism best shown in Flg. 2. This clutch mechanism comprises a double cone 19 carried by the shaft 16 and provided with a central groove 20. This groove receives two blocks 21 and 22 carried by an operating arm 23 which is forked as shown m Fig. 4, the block 21 being earned by one arm of the fork and the block 22 by the other arm. This arm is attached to a short arm 24, a pivot 25 passing through both 23 and 24;.

Attached to the arm 24 is an operating arm 26 pivoted at 27 and connected by a link 28 to an operating lever 29. By movement of the lever 29 it will be ap arent that the forked arm 23 will be rocke about its lvot 25 to move the double cone 19 to therig t or to the left, as the case may be, as vlewed in Fig. 2. At each side of the double cone 19 and attached to the shaft 16 are clutch hubs des ignated 30 and 31. The clutch hub 30 carrles a plurality of pivoted arms 32 and the clutch hub 31 carries a plurality of pivoted arms 33.

When the double cone 19 is moved to the left as viewed in Fig. 2, the arms 32 will s res.

and when the cone is moved to the rig t the arms 33 will be spread. Each of the clutch hubs 30 and 31 carries a disc 34: slidable relatively thereto and having a flange 35 which parent that this movement of the arms will move the disc 35 to the right to spread the ring 35' into frictional engagement with the gear 15, so that the gear will thereby be frictionally clutched to the" shaft 16.- When the double cone is moved in the other direction the arms 32 will be spread to clutch the gear 14 to the shaft 16 in a similar manner. asmuch as the shaft 16 is always running in the same direction and inasmuch as the gears- 14 and 15 are on oppositesides of the gear 13 ing designated 40; the latter is a large sprocket. 42 designates a sprocket chain on sprocket 40' which chain engages small sprocket 43 loose on shaft 44. The sprocket 43 is one of a sprocket cluster, the other sprocket being designated 45, the latterbeinga large sprocket. This sprocket is connected by chain 46 to small sprocket 47 keyed to drive shaft41. The shaft 41 is driven by chahi 48 from any suitable source of ower. The gear train just described provi es the desired gear reduction.

It will be appreciated that, in operation, manipulation of the lever 29 will effect a drive ofthe mast lin either direction desired, the lever being thrown so as to move the double cone 19 either to'the right or left, as viewed in Fig. 2, depending upon the, direction in which it is desired to have the mast travel. Q

It will be seen from the foregoing that I have provided a hoisting apparatus comprising a mast and a standard in which the bottom of the mast is so formed as to provide a bull wheel, this formation on the bottom of the mast permitting of the detachable attach-- ment of a toothed segment to the periphery. thereofheld inplace by the sprocket chain by which the mast is driven.

It will be s'een also by providing afriction drive for the mast adapted to slip under predetermined conditions undue stresses and strains on any part of the apparatus are eliminated.

As above noted it will be. appreciated also i that by the particular clutch arrangement employed the mast may be driven in either direction as desired, depending upon the direction in which the lever 29 is moved.

The sprocket 11 which carries the sprocket of the shaft taking any load to which it is likely to be subjected. The lower bearing is bility of the operator attempting to raise a load withthe boom 4 directly over him, it

being appreciated that before the boom has swung to such position the chain 10 will have disengaged the teeth of the tooth segment. Inasmuch as the operator may accidentally swing. the boom until the chain 10 disengages the teeth 9, I have provided two holes 51 and 52 in the web 6 of flange 5, whereby a pin may be inserted and function as a sprocket tooth engaging chain 10, to permit of the mast being rotated back into proper position for engagement of chain 10 with teeth 9.

It is to be understod that changes may be made in the details of construction above described within the purview of my invention.

What I claim is 1. Hoisting mechanismcomprising, in combination: a standard; a mast, rotatable thereon; driving mechanism for the mast, including a toothed se ment carried by the mast,

and a sprocket-c ain engaging the teeth of ing a toothed segment carried by the mast,

May, 1929.

CHARLES G. WRIGHT. 

